Browsing by Author "Elhajj, I."

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    Data centric adaptive in-network aggregation for wireless sensor networks
    (IEEE/ASME International Conference, 2007) Weerasinghe, K.G.H.D.; Elhajj, I.; Krsteva, A.; Najm, M.A.
    This paper presents and evaluates a data centric adaptive in-network aggregation algorithm for wireless sensor networks. In-Network data aggregation is used in wireless sensor networks to reduce the power consumption of sensor nodes. The accuracy of the aggregated results is highly sensitive to delays in the measurements. All existing methods use fixed time limit to accept delayed information for aggregation. The proposed method dynamically calculates the delay limit by using the historical behavior of each sensor. The presented simulation results illustrate the advantage of the developed algorithm.
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    Human Perception of Haptic Force Direction
    (IROS 2006 IEEE/RSJ International Conference, 2006) Elhajj, I.; Weerasinghe, K.G.H.D.; Dika, A.; Hansen, R.
    In this paper we investigate the accuracy of human perception of haptic force direction applied to the hand. Haptic interfaces are commonly used in many applications and understanding the limitations of human perception would facilitate the design of these interfaces and the associated applications. The literature contains work related to force perception; however, none of which address the issue of the accuracy of haptic force direction perception. We discuss the design and implementation of the experiment used to evaluate the accuracy. Also presented are results related to training effects, fatigue and accuracy across angular regions